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In the field of strongly correlated electron systems, there is a long standing discussion on whether lattice degrees of freedom play a role for several physical phenomena, among them the Mott MI transition and charge-ordering transition. Charge-transfer salts of the ..-(BEDT-TTF)2X and (TMTCF)2X families have been revealed as model systemss for the study of the latter phenomena. The (TMTCF)2X salts have been recognized as model systems for studying correlation effects in 1D, while the (BEDT-TTF)-based materials for such studies in 2D. In this work, high-resolution dilatometry experiments were performed in order to address these issues. The main results obtained are summarized below. ...